China high-intensity accelerator technology developments for Neutron Sources & ADS
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1 AT/INT-04 China high-intensity accelerator technology developments for Neutron Sources & ADS J. Wei, Tsinghua University, China S.N. Fu, IHEP, CAS, China International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators Vienna, Austria, May 4 May 8,
2 Outline Introduction High-intensity proton accelerator programs ADS accelerator program China Spallation Neutron Source project Compact Pulsed Hadron Source project Accelerator technology developments Discussions & summary 2
3 Introduction 3
4 Major existing/proposed accelerator & neutron sources BEPC CIAE/CARR CPHS CSR NSRL SSRF NSRRC CSNS 4
5 SSRF: the 4th light source in China Shanghai synchrotron light source, 2008 Courtesy SSRF 5
6 Major demands for hadron accelerator ADS for nuclear waste transmutation Thorium fueled accelerator driven subcritical reactor (ADS) for power generation multi-disciplinary platform neutron source ion beam therapy compact neutron and proton sources 6
7 ADS for waste transmutation By 2020, addition of nuclear power of 40 GWe, by 2050 reaching 240 GWe. 25 tons of waste per 1 GWe reactor plant. Transmutation of MA and LLFP material. 7
8 Neutron scattering applications China high int. accel.1960 on neutron sources & ADS, J. Wei et al
9 High-intensity proton accelerator programs 9
10 ADS accelerator program 10
11 ADS program 3.5 MeV front end 11
12 ECR ion source 12
13 4-vane RFQ achieved: 3.5 MeV 49 93% 15% rf duty 7% beam duty RF: ±1%, ±1 o 13
14 CSNS project 14
15 China Spallation Neutron Source layout facility site: Dongguan, Guangdong 15
16 CSNS layout to scale 16
17 High beam power frontier & CSNS 17
18 CSNS primary design parameters Phase I II ultimate Beam power on target [kw] Beam energy on target [GeV] Ave. beam current [µa] Pulse repetition rate [Hz] Protons per pulse [10 13 ] Linac energy [MeV] Linac type DTL DTL DTL+SCL Target number Target material Tungsten Moderators Number of spectrometers H 2 O (300K), L-H 2 (20K) coupled & decoupled 3 18 >18 18
19 CSNS proposal proposal accepted on Sept
20 CSNS rapid cycling synchrotron 20
21 CPHS project 21
22 Compact Pulsed Hadron Source 22
23 CPHS in phases Phase II Reflectometer Devices Imagining Powder Activation diffraction SANS Medical Reflectometry: Films & (internal) surfaces including liquid interfaces Sensor & device heterostructures Biology, nanobiotechnology Polymers and soft matters Complex systems Phase I SANS: Large (~1-100nm) structure of assemblies in solid, liquid, powder forms Micro-to-nano structures of composites Biology, nanobiotechnology Polymers and soft matters Complex systems Devices: Frontiers of neutron optics Beam filters Detector development Neutron polarization Medical: Neutron therapy BNCT Nuclear medicine Powder diffraction: Crystal structure Solid-state chemistry & physics Novel materials Activation: Chemical analysis of materials Elementary analysis Nuclear materials, security 23
24 CPHS major parameters ion source, RFQ, DTL, RF Be target neutron scattering neutron imaging proton application Phase I program in 3 years Existing building on main campus Starting funds available 24
25 Accelerator technology developments 25
26 Collaboration worldwide Tremendous help from ISIS, J-PARC, KEK, BNL, SNS, CERN, PSI, IPNS, LBNL MOST, NSFC, JSPS 26
27 CSNS component prototyping Vacuum chamber Power supply Injection bump H- IS, 50 kev Ip = 20 ma RFQ, 3 MeV 324 MHz DTL, 80 MeV Iave=75 µa Room for higher energy linac Linac RF Bending dipole RCS 1.6 GeV 25 Hz, 63 µa Extraction Collimation & cleaning Ring RF Future medical applications Future proton applications To future second target, muon target, fast neutron Target station & neutron instruments 27
28 effect 28
29 1.3 GHz, β=0.45 superconducting RF cavity IHEP, CAS Beijing Univ. 29
30 RCS magnet & measurement system Inst. High Energy Physics Inst. Modern Physics 30
31 Rotating target mock-up IHEP & Inst. of Physics CAS 31
32 Discussions & summary 32
33 A possible hadron facility layout IS neutron instruments 1: neutron R&D beamline 2: engineering diffraction 3: irradiation station 4: neutron radiography/ imaging 5: small angle neutron scattering 6: neutron therapy RF Q A Proton accelerator DTL B Neutron applications target station 2 C Proton applications proton stations G ADS rotation gantry fixed gantry calibration gantry D Hadron therapy synchrotron 33
34 small 34
35 Laser-generated nanosecond pulsed neutron sources: scaling from VULCAN to table-top, Zager et al, New J. Phys.(2005) Compact, table-top sources yet producing useful neutron fluxes for practical applications Broad fast neutron spectrum Forward directed beams Pulsed operation, short pulse and high repetition rates Neutron Interrogation Devices Courtesy C. K. Loong Using neutron/proton-induced reactions for non-destructive bulk elemental analysis. Detecting buried objects, mine clearing, geophysical applications, 35
36 Key challenges A common challenge in pursuing hadron accelerator facilities in China is the extremely low level of funding and a lack of expertise Projects typically cost less than 1/2 of non-labor cost of USA Solution: extensive R&D and prototyping Import & improve advanced technology; collaborate worldwide Develop domestic, industrial vendors to control project cost 36
37 Summary In China, there are great interests in: ADS programs for nuclear waste transmutation and power generation multi-disciplinary platform neutron source Ion-beam therapy compact neutron and proton sources Keys to the success: collaborate worldwide, and develop domestic industry 37
38 THANK YOU! 38
39 Acknowledgements To the CSNS team Institute of High Energy Physics and Institute of Physics; Chinese Academy of Sciences To the CPHS team Dept. Engineering Physics, Tsinghua University; C.K. Loong To the ADS program team China Institute of Atomic Energy; Beijing University; IHEP, CAS To friends, colleagues, and collaborators in China and worldwide RAL of UK; KEK and JAEA (J-PARC) of Japan; BNL, ORNL, ANL, and LANL of USA; and PEFP of Korea 39
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